import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class ShareResourse{
    private int number=1; //1:A线程 2:B线程 3:C线程
    private Lock lock=new ReentrantLock();
    private Condition c1=lock.newCondition();
    private Condition c2=lock.newCondition();
    private Condition c3=lock.newCondition();

    public void printNumber(int num){
        if(num==5){
            lock.lock();
            try {
                //判断
                while (number!=1){
                    c1.await();
                }
                //干活
                for (int i = 1; i <= num; i++) {
                    System.out.println(Thread.currentThread().getName()+"\t"+number);
                }
                number=2;
                c2.signal();

            }catch (Exception e){
                e.printStackTrace();
            }finally {
                lock.unlock();
            }
        }
        if(num==10){
            lock.lock();
            try {
                //判断
                while (number!=2){
                    c2.await();
                }
                //干活
                for (int i = 1; i <= num; i++) {
                    System.out.println(Thread.currentThread().getName()+"\t"+number);
                }
                number=3;
                c3.signal();

            }catch (Exception e){
                e.printStackTrace();
            }finally {
                lock.unlock();
            }
        }
        if(num==15){
            lock.lock();
            try {
                //判断
                while (number!=3){
                    c3.await();
                }
                //干活
                for (int i = 1; i <= num; i++) {
                    System.out.println(Thread.currentThread().getName()+"\t"+number);
                }
                number=1;
                c1.signal();

            }catch (Exception e){
                e.printStackTrace();
            }finally {
                lock.unlock();
            }
        }

    }
}
/**
 * @auther: Alessio
 * @date: 2021/1/14
 * 题目：多线程之间按顺序调用，实现 A-> B -> C 三个线程启动，要求如下：
 * AA打印5次，BB打印10次，CC打印15次
 * 紧接着
 * AA打印5次，BB打印10次，CC打印15次
 * ..
 * 来10轮
 */
public class SyncAndReentrantLockDemo {

    public static void main(String[] args) {

        ShareResourse shareResourse = new ShareResourse();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                shareResourse.printNumber(5);
            }

        },"AA").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                shareResourse.printNumber(10);
            }
        },"BB").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                shareResourse.printNumber(15);
            }
        },"CC").start();

    }
}
